1) However I do not want to move my itunes Music onto the flash drive, only my Movies, and want to keep my music on my hard drive.
Is this possible?
2) Do the MacBook Air's not have a separate program other than itunes that can play movies? If so, is there a program I can get to solve this problem? I went onto the App Store to see if there was something I could download, but all the apps were for creating DVD's, not simply playing them.
If you can play the movies in iTunes, you should be able to open the movie files using Quicktime, which should already be on your system. If you have already transferred the files to your flash drive, open the flash drive in Finder, and hold control when you click on the movie file (or right click if you have the enabled) and select Open With Quicktime Player. This should play the movie directly from the flash drive.
If you want to set all .m4v files to open with Quicktime by just double clicking on the file, you can follow the steps here: http://www.tech-recipes.com/rx/2573/os_x_how_to_change_default_application_to_op en_file_type/
3) If 1. & 2. questions are solvable, will it then be safe to delete the movies from my itunes?
You can move the TV shows to your flash drive by dragging them from the iTunes window to your flash drive in Finder or the flash drive icon on the desktop. When you are sure everything is transferred over to your external device, you can delete the movie from iTunes. I recommend playing the videos from the flash drive first before deleting them in iTunes.
To delete the videos from iTunes, you can highlight them and press the delete key on your keyboard. In the next prompt, you would want to move it to the trash so that it is deleted from your internal hard drive.
I hope that helps!